Merge 98492 - REGRESSION (r94887): Scrolling the HTML spec is more jerky now than it was (regress...

Source/WebCore/css/SelectorChecker.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 465 matching lines @@
     case CSSSelector::Child: 
         {
             ContainerNode* n = e->parentNode();
             if (!n || !n->isElementNode())
                 return SelectorFailsCompletely;
             e = static_cast<Element*>(n);
             return checkSelector(sel, e, dynamicPseudo, false, visitedMatchType);
         }
     case CSSSelector::DirectAdjacent:
         {
-            if (!m_isCollectingRulesOnly) {
-                RenderStyle* currentStyle = elementStyle ? elementStyle : e->renderStyle();
-                if (currentStyle)
-                    currentStyle->setAffectedByDirectAdjacentRules();
+            if (!m_isCollectingRulesOnly && e->parentNode() && e->parentNode()->isElementNode()) {
+                RenderStyle* parentStyle = elementStyle ? elementParentStyle : e->parentNode()->renderStyle();
+                if (parentStyle)
+                    parentStyle->setChildrenAffectedByDirectAdjacentRules();
             }
             Node* n = e->previousSibling();
             while (n && !n->isElementNode())
                 n = n->previousSibling();
             if (!n)
                 return SelectorFailsLocally;
             e = static_cast<Element*>(n);
             return checkSelector(sel, e, dynamicPseudo, false, visitedMatchType);
         }
     case CSSSelector::IndirectAdjacent:
@@ skipping 871 matching lines @@
     }
     return linkMatchType;
 }
 
 bool SelectorChecker::isFrameFocused(const Element* element)
 {
     return element->document()->frame() && element->document()->frame()->selection()->isFocusedAndActive();
 }
 
 }